Inner Tube Sizes

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I have just bought an '07 TE450 and love it. I have a little problem though, it has mouses in the tires and they feel like they are breaking down as the tyre runs all over the place. I would like to stick a tube in the tyre but cannot find a definative answer as to what size tube I need. Its currently running a 140/80 I was looking at a 450-510 tube does that sound about right?